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Construction of dsDNA biosensor based on dendritic SiO2 nanoparticle and investigation on its interaction with benzo[a]pyrene

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Abstract

In this work, a new dsDNA biosensor was constructed to monitor the interaction of DNA and benzo[a]pyrene (BaP). Firstly, dendritic SiO2 nanoparticles were synthesized by silanization of SiO2 nanoparticles with (γ-(methacryloyloxy)propyl) trimethoxysilane and polymerization with acrylic acid. Then, due to the rich carboxyl groups of these nanoparticles, they were associated with the amino groups of a self-assembly membrane formed on the gold electrode by a sulfur-containing compound, 5-amino-3-mercapto-1,2,4-triazole. Finally, dsDNA was immobilized on the electrode surface by static adsorption with the aid of metallic ion. The whole immobilization steps were characterized by cyclic voltammogram and electrochemical impedance spectrum. After that, using methylene blue as a probe, the interaction of BaP with dsDNA was investigated. A linear relationship between the percentages of current decrease with the logarithm of BaP concentrations was found in the range from 0.33 to 133 μM.

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Acknowledgments

The authors thank for the financial support of the National Basic Research Program of China (2009CB421601), Natural Science Foundation of China (21105030, 20827006), the Education Department for New Teacher of Guangdong Province, and the key Academic Program of 211 Project of South China Agricultural University (2009B010100001).

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Correspondence to Yingju Liu.

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Liu, Y., Ye, Z., Shao, G. et al. Construction of dsDNA biosensor based on dendritic SiO2 nanoparticle and investigation on its interaction with benzo[a]pyrene. J IRAN CHEM SOC 9, 129–136 (2012). https://doi.org/10.1007/s13738-011-0036-5

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  • DOI: https://doi.org/10.1007/s13738-011-0036-5

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